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Influence of Air Contact on the Surface Wettability of Coal and Its Filtration and Flotation Properties

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Abstract

In a laboratory experiment, samples of SS coal prepared in an inert atmosphere (nitrogen) and by standard methods in air are compared. The surface changes of the coal particles are studied by IR spectral analysis and chemical analysis of functional oxygen groups. The wetting properties of the coal are assessed by complementary methods: determination of the limiting wetting angle for a liquid drop; liquid filtration through a layer of coal powder; and reagent flotation. Exposure of the coal surface to air during sample preparation perceptibly changes the function composition and hence the natural hydrophobic properties of the coal particles. The results may be used to refine estimates of the properties of undisturbed coal in beds and to improve methods of sample preparation and coal enrichment and processing.

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ACKNOWLEDGMENTS

We thank T.A. Panina and A.V. Anikina (Coal Institute, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences) and S.A. Sozinov and S.Yu. Lyrshchikov (Collective Use Center, Federal Research Center of Coal and Coal Chemistry) for assistance in physicochemical methods of analysis.

Funding

Financial support was provided within the framework of state project FWEZ-2021-0002 at the Federal Research Center of Coal and Coal Chemistry, Coal Institute, Siberian Branch, Russian Academy of Sciences, with the goal of developing effective technologies for robotic coal extraction (without the need for constant human presence); and developing control systems and diagnostic and predictive methods for mining systems so as to ensure continued availability of mineral resources (registration code AAAA-A21-121012290021-1).

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Authors and Affiliations

  1. Coal Institute, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia

    Yu. F. Patrakov, S. A. Semenova & A. V. Yarkova

  2. Gorbachev Kuznetsk Basin State Technical University, Kemerovo, Russia

    A. V. Yarkova & M. S. Klein

Authors
  1. Yu. F. Patrakov
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  2. S. A. Semenova
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  3. A. V. Yarkova
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  4. M. S. Klein
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Corresponding authors

Correspondence to Yu. F. Patrakov, S. A. Semenova, A. V. Yarkova or M. S. Klein.

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The authors of this work declare that they have no conflicts of interest.

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Translated by B. Gilbert

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Patrakov, Y.F., Semenova, S.A., Yarkova, A.V. et al. Influence of Air Contact on the Surface Wettability of Coal and Its Filtration and Flotation Properties. Coke Chem. 66, 283–288 (2023). https://doi.org/10.3103/S1068364X23700849

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